JP2013253706A - Control device of cooling facility apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for stabilizing cooling ability of a cooling facility apparatus including an ice thermal storage part.SOLUTION: In a control device of a cooling facility apparatus including an ice thermal storage unit which stores cold air by making ice, a control part 46 controls operation ability of the cooling facility apparatus by changing control data which is set in the cooling facility apparatus. At a time point of a prescribed time before the ice thermal storage unit starts heat storage, the operation ability of the cooling facility apparatus after the time point is set to be higher than the operation ability of the cooling facility apparatus at the time point.

Description

  The present invention relates to a control device for a cooling device that controls the cooling device, and more particularly, to a control device for a cooling device including an ice regenerator.

  A cooling system including a showcase installed in a store such as a supermarket and a cooling device such as a refrigerator connected to the showcase is known. These refrigeration systems generally constitute a refrigeration cycle in which a refrigerant circulates by connecting a compressor, a condenser, an evaporator, and the like in a circular manner by a refrigerant pipe or the like.

  Normally, the control of the operation and stop of these compressors, condensers, showcases and other refrigeration equipment is performed by adjusting the pressure of the refrigerant obtained from the sensor connected to the input / output port of each equipment, the cold air discharge temperature of the showcase, etc. This is done by transmitting control data to the refrigeration equipment based on the physical characteristics. This control data is generally set to be suitable for situations where the most cooling capacity is required in the summer, and the cooling capacity tends to be excessive in the winter season when high cooling capacity is not required. It was in.

  Therefore, from the viewpoint of reducing energy costs in recent years, it is determined that the showcase is cold if the deviation temperature between the discharge temperature of the cool air and the set temperature of the showcase for a certain time is not more than a predetermined temperature. Then, by changing the low pressure setting value of the compressor and reducing the operating capacity of this compressor (reducing the number of operating compressors, reducing the rotational speed of the compressor, etc.) It has been proposed (see Patent Document 1).

  Although the above-described method can efficiently operate the compressor, there is no contrivance for utilizing midnight power, which is generally low in cost. Therefore, ice heat storage technology has been devised in which ice making is performed at night and the cold air is used in combination with refrigeration equipment during the day.

Japanese Patent No. 3603497

  In ice heat storage systems that make ice using refrigerant circulating in refrigeration equipment, some or all of the refrigerant is used for ice making during ice making, so the cooling capacity for the showcase may temporarily decline. is there. Therefore, for example, in a store that operates 24 hours, such as a convenience store, care must be taken so that the cooling capacity for the showcase does not decrease too much even during ice making.

  This invention is made | formed in view of such a condition, The objective is to provide the control apparatus which stabilizes the cooling capability of the cooling equipment containing an ice thermal storage part.

  One embodiment of the present invention is a control device for a cooling apparatus including an ice regenerator. This apparatus includes a control unit that controls the operation capacity of the refrigeration equipment by changing control data set in the refrigeration equipment. Here, at the time before the predetermined time before the ice heat accumulator starts to store heat, the control unit makes the operating capacity of the refrigeration equipment higher than that at the time.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the control apparatus which stabilizes the cooling capability of the refrigeration apparatus containing an ice thermal storage part can be provided.

It is a figure which shows typically the structure of the cooling system which concerns on embodiment. It is a figure which shows typically the internal structure of the integrated controller which concerns on embodiment. It is a figure which illustrates the temperature transition in a showcase warehouse, the set temperature in a showcase warehouse, the change of a low voltage | pressure set value, and the minimum of a low voltage | pressure set value. It is a figure which shows the example of the temperature transition in a showcase warehouse, and the preset temperature in a showcase warehouse. It is a figure which shows another example of the temperature transition in a showcase warehouse, and the preset temperature in a showcase warehouse. It is a figure which shows an example of the structure of the database which matched the temperature transition in the store | warehouse | chamber of a showcase, and the preset temperature at that time. It is a flowchart explaining the flow of a process of the integrated controller which concerns on embodiment. It is a figure which shows another example of the temperature transition in a showcase warehouse, the setting temperature in a showcase warehouse, the change of a low voltage | pressure set value, and the minimum of a low voltage | pressure set value.

  An outline of the embodiment will be described. The cooling system 100 according to the embodiment suppresses insufficient cooling of the showcase and the like by increasing the cooling capacity of the cooling system in advance before the ice making operation of the ice heat storage unit at night or the like.

  FIG. 1 is a diagram schematically showing the configuration of the cooling system 100. The refrigeration system 100 includes a condenser 10, a showcase 20, a refrigerator 18, a showcase controller 32, a condenser controller 34, a compressor controller 36, a refrigerant pipe 16, an integrated controller 30, and an ice heat storage unit 42.

  The showcase 20 further includes a first solenoid valve 24a and a second solenoid valve 24b collectively referred to as an electromagnetic valve 24, a first expansion valve 26a and a second expansion valve 26b collectively referred to as an expansion valve 26, a discharge temperature. A first discharge temperature sensor 38a and a second discharge temperature sensor 38b, which are collectively referred to as a sensor 38, and a first evaporator 28a and a second evaporator 28b, which are collectively referred to as an evaporator 28, are included. The ice heat storage unit 42 includes an ice heat storage unit 44, a third electromagnetic valve 24c, a third expansion valve 26c, a first temperature sensor 39a on the refrigerant pipe, and a second temperature sensor 39b on the refrigerant pipe. . Of these, the third solenoid valve 24c and the third expansion valve 26c are collectively referred to as the solenoid valve 24 and the expansion valve 26 of the showcase 20, respectively, and the first temperature sensor 39a on the medium pipe and the refrigerant pipe on the refrigerant pipe. The second temperature sensor 39b is collectively referred to as the temperature sensor 39 on the refrigerant pipe.

  The refrigerator 18 further includes a first compressor 14a, a second compressor 14b, and a third compressor 14c, which are collectively referred to as the compressor 14, and a first unloader 22a, a second compressor, which are collectively referred to as an unloader 22. An unloader 22b, a third unloader 23c, and a low pressure sensor 40 are included.

  Hereinafter, devices constituting a refrigeration cycle in which a compressor, a condenser, an evaporator and the like are annularly connected by a refrigerant pipe or the like to circulate the refrigerant may be collectively referred to as “cooling devices”. In the present embodiment, the refrigeration equipment includes equipment having a refrigerant circuit such as refrigeration equipment, refrigeration equipment, and air conditioning equipment.

  The refrigeration system 100 is installed in a store such as a supermarket. In the refrigeration system 100 installed in the store, an integrated controller 30 to be described later monitors and controls the operation of the refrigeration system, thereby comprehensively controlling the refrigeration system 100. Therefore, the integrated controller 30 operates as a control device that controls the cooling system 100.

  In the refrigeration system 100, a refrigerant circulation circuit is configured by connecting the refrigeration equipment such as the compressor 14, the condenser 10, and the showcase 20 and the ice regenerator 44 through the refrigerant pipe 16. The high-temperature and high-pressure refrigerant compressed by the compressor 14 releases heat in the condenser 10 and condenses. When the condensed refrigerant is vaporized in the expansion valve 26 in response to opening and closing of the electromagnetic valve 24, it takes away the amount of heat such as ambient air as heat of vaporization. The cooled air is blown out from the discharge unit (not shown) as cold air to cool the inside of the showcase 20. The discharge temperature sensor 38 detects the temperature of the cold air blown from the discharge unit.

  The refrigerant that has passed through the expansion valve 26 becomes a low-temperature and low-pressure gas. The low pressure sensor 40 detects the refrigerant pressure at this time. The compressor 14 compresses the low-temperature and low-pressure refrigerant to bring the refrigerant into a high-temperature and high-pressure state. A refrigeration cycle is configured by repeating the above. The unloader 22 has a function of reducing the pressure of the refrigerant compressed by the compressor 14.

  A compressor controller 36, a condenser controller 34, and a showcase controller 32 are connected to the compressor 14, the condenser 10, and the showcase 20 by control signal transmission lines, respectively, and their operations are controlled. The compressor controller 36, the condenser controller 34, and the showcase controller 32 are further connected to the integrated controller 30. The integrated controller 30 controls the operations of the cooling system 100 as a whole by controlling the operations of the compressor controller 36, the condenser controller 34, and the showcase controller 32.

  The showcase controller 32 is based on the deviation temperature between the actual cold air temperature detected by the discharge temperature sensor 38 and the set temperature of the cold air set as an appropriate value as the temperature of the discharged cold air. Is controlled to open and close and the refrigerant is supplied to the evaporator 28 to cool the inside of the showcase cabinet. Specifically, an upper limit temperature higher than the set temperature is set, and when the temperature in the showcase chamber reaches the upper limit temperature, the solenoid valve 24 is opened and the solenoid valve is closed at the set temperature. To do. Thereby, the discharge temperature of cold air is brought close to the set temperature. The integrated controller 30 sets the cold air set temperature in the showcase controller 32.

  The condenser controller 34 is an appropriate value as the pressure of the refrigerant immediately after the outlet of the condenser detected by a pressure sensor (not shown) provided in the condenser 10 and the pressure of the refrigerant exiting the condenser set from the integrated controller 30. The rotational speed of the fan of the condenser (not shown) is changed based on the deviation pressure from the pressure set as (hereinafter referred to as “high pressure set value”). More specifically, if the pressure detected by the sensor is higher than the high pressure set value, the fan speed is increased to cool the refrigerant, and if the pressure detected by the sensor is lower than the high pressure set value, the fan The cooling speed of the refrigerant is lowered to lower the cooling capacity of the refrigerant, and the detected pressure and the pressure set value are brought closer to each other.

  The operation capacity of the compressor 14 is controlled by the compressor controller 36 at a predetermined cycle based on the low pressure set value. Here, the predetermined cycle is a control cycle determined as a cycle in which the compressor controller 36 controls the operation capability of the compressor 14 based on the low pressure set value, and is, for example, 1 second. The “low pressure set value” is a reference value for changing the operation capacity of the compressor, and specifically includes two threshold values of “cut-in value” and “cut-out value”.

  When the refrigerant pressure acquired by the low-pressure sensor 40 becomes equal to or higher than the “cut-in value”, the operation of the compressor is resumed. When the pressure becomes equal to or lower than the “cut-out value”, the operation of the compressor stops. When the low pressure of the refrigerant changes due to a change in the load on any of the showcases 20 installed in the refrigeration system 100, the compressor controller 36 controls the operation capability of the compressor 14 according to the low pressure set value. . The low pressure set value is variably set by the integrated controller 30 according to the temperature state in the showcase cabinet.

  The ice heat storage unit 42 has two operation states of a heat storage operation and a heat dissipation operation. FIG. 1 shows a refrigeration circuit during heat storage. The ice heat storage unit 42 stores ice in the ice heat storage unit 44 by the heat of vaporization of the low-temperature refrigerant that has passed through the third expansion valve 26c during the heat storage operation. On the other hand, the ice heat storage unit 42 uses a refrigerant pipe (not shown) in a heat exchange unit (not shown) connected between the condenser 10 and the showcase 20 using an antifreeze liquid pipe (not shown) during a heat radiation operation. The refrigerant in 16 is cooled. Thereby, the cooling efficiency of the showcase 20 is improved.

  The ice heat storage unit 42 performs a heat storage operation during a low power cost time period such as at night (for example, from 9:30 pm to 7:30 am on the next day), and performs heat dissipation during other time periods. Thereby, while suppressing the peak value of the electric power use in the daytime, the power cost can also be suppressed.

  FIG. 2 is a diagram schematically illustrating a functional configuration of the integrated controller 30 according to the embodiment. The integrated controller 30 includes a control unit 46, a database 48, and an acquisition unit 50.

  The database 48 stores the operation schedule of the ice heat storage unit 42. As a specific example of the schedule, as described above, the cool air stored in the ice regenerator 44 is radiated from 7:30 am to 9:30 pm, from 9:30 pm to 7:30 am on the next day, The ice regenerator 44 stores heat.

  The control unit 46 sets the control data set by the refrigeration equipment administrator via the acquisition unit 50 in the refrigeration equipment such as the showcase controller 32, the condenser controller 34, or the compressor controller 36. Control the operating capacity of refrigeration equipment. When no control data is input from the manager of the refrigeration equipment, standard control data stored in advance in the database 48 is set in the refrigeration equipment.

  FIG. 2 shows a functional configuration for realizing the integrated controller 30 according to the embodiment, and other configurations are omitted. In FIG. 2, each element described as a functional block for performing various processes can be configured by a CPU (Central Processing Unit), a main memory, and other LSI (Large Scale Integration) in terms of hardware. In terms of software, it is realized by a program loaded in the main memory. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof, and is not limited to any one.

  Hereinafter, details of control by the control unit 46 will be described with reference to the drawings.

  FIG. 3 is a diagram exemplifying a temperature transition 52 in the store of the showcase 20, a set temperature 54 in the store of the showcase 20, a low pressure set value change 56, and a low pressure set value lower limit 58. In the example shown in FIG. 3, the ice heat storage unit 42 radiates the ice regenerator 44 from the ice making end time T1 (7:30 am) to the ice making start time T2 (9:30 pm), and the other time. Consider the case where the belt stores heat in the ice regenerator 44.

  After the ice making end time T1 and before the ice making start time T2, the temperature inside the showcase 20 is stable because the ice regenerator 44 is not making ice. Further, during this period, heat is dissipated from the ice heat storage, and the inside of the showcase 20 is sufficiently cooled together with the refrigerant supplied from the refrigerator. Thereby, the integrated controller 30 determines that the inside of the showcase 20 is sufficiently cooled, and the low pressure set value is set high. As a result, the low-pressure set value is slightly changed, but its behavior is stable. The refrigerant circulating in the refrigerant pipe 16 also has a cooling capacity sufficient to keep the temperature in the cabinet of the showcase 20 stable.

  At the ice making start time T2, the ice heat storage unit 42 starts ice making. The refrigerant circulating in the refrigerant pipe 16 may only have a cooling capacity necessary for maintaining the set temperature 54 in the storage of the showcase 20. Therefore, in such a case, when the ice heat storage unit 42 starts making ice, the cold air is used for heat exchange with the ice heat storage device 44, and therefore, a refrigerant having a temperature necessary to maintain the temperature in the cabinet of the showcase 20 Is not supplied, and the internal temperature rises rapidly. This makes it impossible to keep the temperature inside the showcase 20 stable.

  The showcase controller 32 notifies the integrated controller 30 when the temperature in the cabinet of the showcase 20 rises. The integrated controller 30 instructs the compressor controller 36 to lower the low pressure set value to the low pressure set lower limit value of the refrigerator 18 in order to lower the temperature inside the showcase 20. Here, the “low pressure setting lower limit value” is the lowest value among the low pressure setting values that can be set for the refrigerator.

  However, it takes time for the temperature inside the showcase 20 to change after the low-pressure set value of the refrigerator 18 is lowered, and the increase in the temperature inside the showcase 20 does not immediately stop. For this reason, the temperature in the cabinet of the showcase 20 continues to be higher than the set temperature 54. As the refrigerator 18 operates at a high rate, the temperature inside the storage case of the showcase 20 eventually becomes a normal state that settles near the set temperature 54 and then stabilizes.

  In this way, by determining the low pressure set value of the refrigerator 18 from the temperature in the storage of the showcase 20 and changing the setting of the low pressure set value, the ice heat storage unit existing on the refrigerant pipe 16 other than the showcase 20 is changed. When the refrigeration equipment such as 42 starts operating, the temperature inside the showcase 20 is affected. In addition, even if the low pressure set value of the refrigerator 18 is lowered after the temperature in the storehouse of the showcase 20 rises, the temperature in the storecase of the showcase 20 falls into a state higher than the set temperature 54. It is difficult to prevent.

  Therefore, the control unit 46 performs control so that the operating capacity of the refrigeration equipment after that time is higher than the operating capacity of the refrigeration equipment at that time after the predetermined time before the ice regenerator 44 starts to store heat. To do. More specifically, the control unit 46 sets the set temperature 54 after that time at a time before the ice heat accumulator 44 starts to store heat lower than the set temperature 54 at that time. Here, the “predetermined time” is a preparatory period for increasing the operation capacity of the refrigeration equipment in advance in anticipation of additional operation of the refrigeration equipment, and is, for example, 3 hours 30 minutes. The predetermined time is stored in the database 48 in advance. The initial value for the predetermined time can be arbitrarily set by the administrator.

  FIG. 4 is a diagram illustrating an example of the temperature transition 52 in the showcase 20 and the set temperature 54 in the showcase 20. In the example shown in FIG. 4, the set temperature 54 in the cabinet of the showcase 20 is set low at a preparation start time T3 that is a time before the ice making start time T2 of the ice heat storage section 42, and preparation for ice making is started. During the time period from the preparation start time T3 to the ice making start time T2, the interior of the showcase 20 is supercooled.

  The control unit 46 acquires the ice making start time T <b> 2 of the ice heat storage unit 42 from the operation schedule of the ice heat storage unit 42 acquired from the database 48. The control unit 46 also obtains a preparation period for increasing the operation capacity of the refrigeration equipment from the database 48, and determines a time period during which the interior of the showcase 20 is supercooled. The control unit 46 obtains the time from a timer (not shown), obtains the temperature set to supercool the interior of the showcase 20 when the preparation start time T3 is reached, and the showcase controller 32. Set to.

  Here, the temperature set to supercool the interior of the showcase 20 is a temperature lower than the set interior temperature before the preparation start time T3. For example, if the temperature in the cabinet before the preparation start time T3 is 5 degrees, the control unit 46 sets the set temperature during the supercooling control state to 0 degrees. This temperature may be acquired from the administrator of the refrigeration equipment via the acquisition unit 50, or a value stored in the database 48 in advance may be acquired.

  As a result, the inside temperature of the showcase 20 is supercooled. For this reason, even if the temperature in the storehouse of the showcase 20 rises when the ice heat storage unit 42 starts to store heat, the temperature in the storecase of the showcase 20 before the start of heat storage is in a supercooled state, so the normal state Lower temperature is maintained. Therefore, the temperature in the cabinet of the showcase 20 can be kept low for a period required for the compressor controller 36 to increase the cooling capacity of the entire refrigeration equipment by lowering the low pressure set value of the refrigerator 18.

  After the ice heat storage unit 42 starts the heat storage, the set temperature 54 is returned to the original. This may be returned to the supercooled temperature at once, or may be returned in multiple times (for example, divided into 5 times and raised 5 times in total).

  FIG. 5 is a diagram illustrating an example of the temperature transition 52 in the showcase 20 and the set temperature 54 in the showcase 20. FIG. 5 shows that, after the preparation start time T3, after the ice making start time T2 at which the ice heat storage unit 42 starts to store heat even though the control unit 46 has lowered the set temperature 54 in the showcase 20 chamber, An example in which the temperature inside the case 20 has risen and the inside has become a high temperature state is shown.

  As shown in FIG. 6, the database 48 includes the temperature transition 52 in the storage of the showcase 20 acquired via the discharge temperature sensor 38 in the supercooled state and the period immediately after the ice heat storage operation (for example, 1 hour), The preset temperature 54 is stored in association with each other. However, the temperature data is not stored in the database 48 during the defrosting operation and until the showcase 20 returns to the normal cooling state immediately after the defrosting operation. The control unit 46 refers to the database 48 based on the set temperature 54 acquired from the administrator via the acquiring unit 50, acquires the past temperature transition in the warehouse at the set temperature 54, and indicates the temperature transition. When the temperature exceeds a predetermined temperature, the temperature is corrected and set to a temperature lower than the set temperature 54 acquired by the acquisition unit 50. Here, the “predetermined temperature” is a temperature at which the showcase 20 is appropriately cooled in order to store a product or the like stored in the cabinet, and is a temperature that varies depending on what is stored.

  Instead of or in addition to setting the set temperature 54 to a lower temperature, the control unit 46 sets a longer preparation period for increasing the operating capacity of the cooling equipment. Thereby, even when a sufficient effect cannot be obtained due to the change of the set temperature, the integrated controller 30 can prevent the internal temperature of the showcase 20 from rising more than necessary by resetting the next set temperature. it can.

  The control unit 46 also refers to the database 48 based on the set temperature 54 acquired from the administrator via the acquisition unit 50, acquires the past temperature transition in the warehouse at the set temperature 54, and When the temperature shown is equal to or lower than the predetermined temperature, the temperature is corrected and set to a temperature higher than the set temperature 54 acquired by the acquisition unit 50. Instead of setting the set temperature 54 to a higher temperature, or in addition to that, the control unit 46 sets a short preparation period for increasing the operating capability of the cooling equipment. Thereby, cost, such as electric power required in order to make the inside of the store | warehouse | chamber of the showcase 20 into supercooling, can be suppressed.

  FIG. 7 is a flowchart for explaining the processing flow of the integrated controller 30 according to the embodiment. The processing in this flowchart starts when the integrated controller 30 is activated.

  The controller 46 stands by without performing any special processing before the preparation start time T3 (N in S1). When the preparation start time T3 is reached (Y in S1), the control unit 46 obtains a temperature that is set to bring the interior of the showcase 20 into a supercooled state (S2).

  Subsequently, the control unit 46 refers to the database 48 based on the acquired set temperature, and acquires a history of temperature transition in the past at the set temperature (S3). When the set temperature needs to be corrected, for example, when the acquired temperature transition exceeds a predetermined temperature (Y in S4), the control unit 46 corrects the set temperature (S5). When it is not necessary to correct the set temperature (N in S4), the control unit 46 does not correct the set temperature.

  The controller 46 sets a preset temperature lower than the preset temperature before the preparation start time T3 by setting the preset temperature in the showcase controller 32 (S6). Until the ice making start time T2 is reached (N in S7), the set temperature is lower than the set temperature before the preparation start time T3, and the inside of the showcase 20 is supercooled. When the ice making start time T2 is reached (Y in S7), the control unit 46 returns the set temperature to the set temperature before the preparation start time T3 (S8).

  The operation according to the above configuration is as follows. The control unit 46 lowers the set temperature in the storage of the showcase 20 when the preparation start time T3 for bringing the inside of the storage of the showcase 20 into a supercooled state, and puts the inside of the storage into a supercooled state. Thereafter, after the ice making start time T2, the set temperature in the showcase 20 is restored.

  As described above, according to the integrated controller 30 according to the embodiment of the present invention, the cooling capacity of the refrigeration equipment including the ice heat storage unit can be stabilized.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. is there.

  In the above-described embodiment, the example in which the set temperature in the cabinet of the showcase 20 is set as control data for controlling the operation capability of the showcase 20 has been described. However, the control data is the low pressure of the refrigerant circulating in the cooling system 100. It may be a set value. This case will be described below.

  FIG. 8 is a diagram showing another example of the temperature transition 52 in the showcase store, the set temperature 54 in the showcase store, the change 56 in the low pressure set value, and the lower limit 58 of the low pressure set value. In this example, the control unit 46 instructs the compressor controller 36 to lower the low pressure set value of the refrigerator 18 to the lower limit 58 of the low pressure set value at a time T4 immediately before the ice making start time T2 (for example, 10 minutes before). Instruct. Thus, the refrigerant necessary for the ice making operation by the ice heat storage unit 42 and maintaining the temperature in the showcase 20 after the ice making start time T2 is prepared.

  Thereby, even if the ice thermal storage part 42 starts ice making, the temperature rise in the storehouse of the showcase 20 can be suppressed, and the temperature in the storehouse of the showcase 20 can be kept normal. Compared to the case where the set temperature in the showcase 20 is controlled, the cooling capacity of the cooling system 100 as a whole is improved. Therefore, a high cooling capacity such as when the summer temperature is high or there are many showcases 20 exists. It can also cope with scenes that require

  Similarly to the case where the set temperature in the showcase 20 is set as control data, the temperature transition 52 in the showcase 20 acquired via the discharge temperature sensor 38 in the database 48 and the low pressure at that time are obtained. Store the setting values in association with each other. The control unit 46 refers to the database 48 based on the low pressure setting value acquired from the administrator via the acquisition unit 50, acquires the past temperature transition in the warehouse at the low pressure setting value, and indicates the temperature transition When the temperature is higher than a predetermined temperature, it may be corrected and set to a low pressure set value lower than the low pressure set value acquired by the acquisition unit 50.

  Similarly, the control unit 46 acquires the temperature transition in the past warehouse at the low pressure set value by referring to the database 48 based on the low pressure set value acquired from the administrator via the acquisition unit 50, and the temperature When the temperature indicated by the transition is equal to or lower than the predetermined temperature, the temperature may be corrected and set to a temperature higher than the low pressure set value acquired by the acquisition unit 50. These effects are the same as in the case where the set temperature in the cabinet of the showcase 20 is used as control data.

  In the above description, the control unit 46 has described the case where the ice making start time T2 and the preparation start time T3 are acquired by referring to the database 48. However, the administrator uses a user interface such as a controller (not shown). The control unit 46 may be notified. Thereby, the ice making schedule of the ice heat storage unit 42 can be flexibly changed.

  Alternatively, the control unit 46 may determine when the ice heat storage unit 42 is radiating heat or storing heat from information of the temperature sensor 39 on the refrigerant pipe installed in the ice heat storage unit 42. Thereby, since the ice making start time T2 of the ice heat storage unit 42 can be automatically determined, it is possible to automatically take measures such as rapidly reducing the low pressure set value of the refrigerator 18 to the lower limit 58 of the low pressure set value. . Alternatively, the ice making start time T <b> 2 may be automatically acquired via a communication device (not shown) attached to the ice heat storage unit 42.

  In the above description, the case where the preparation start time T3 is determined with the ice making start time T2 as a starting point has been described. After reaching the internal temperature, the ice heat storage unit 42 may start heat storage by ice making. In this case, it is advantageous in that the interior of the showcase 20 can be surely brought into a supercooled state.

  DESCRIPTION OF SYMBOLS 10 Condenser, 14 Compressor, 16 Refrigerant piping, 18 Refrigerator, 20 Showcase, 22 Unloader, 24 Solenoid valve, 26 Expansion valve, 28 Evaporator, 30 Integrated controller, 32 Showcase controller, 34 Condenser controller, 36 Compressor controller, 38 discharge temperature sensor, 39 temperature sensor on refrigerant pipe, 40 low pressure sensor, 42 ice heat storage unit, 44 ice heat storage unit, 46 control unit, 48 database, 50 acquisition unit, 100 refrigeration system.

Claims (7)

A control device for a cooling device including an ice regenerator,
Including a control unit for controlling the operation capacity of the refrigeration equipment by changing the control data set in the refrigeration equipment,
The control unit, at a time before a predetermined time before the ice regenerator starts storing heat, makes the operating capacity of the cooling equipment after that time higher than the operating capacity of the cooling equipment at that time. Control device for refrigeration equipment. The control data is a set temperature in a showcase cabinet included in the cooling equipment,
The said control part sets the said preset temperature after the said time lower than the said preset temperature at the said time at the time before the predetermined time when the said ice heat storage starts heat storage, The said control temperature is characterized by the above-mentioned. Control device. An acquisition unit for acquiring a set temperature set by the control unit;
A database that stores the set temperature set by the control unit in the past and the temperature transition in the showcase at that time in association with each other;
The control unit refers to the database based on the set temperature acquired by the acquisition unit, acquires a past temperature transition at the set temperature, and when the temperature indicated by the temperature transition exceeds a predetermined temperature, The control device according to claim 2, wherein a temperature lower than the set temperature acquired by the acquisition unit is set. An acquisition unit for acquiring a set temperature set by the control unit;
A database that stores the set temperature set by the control unit in the past and the temperature transition in the showcase at that time in association with each other;
The control unit refers to the database based on the set temperature acquired by the acquisition unit, acquires a past temperature transition at the set temperature, and when the temperature indicated by the temperature transition is equal to or lower than a predetermined temperature, The control device according to claim 2, wherein a temperature higher than the set temperature acquired by the acquisition unit is set. The control data is a low pressure set value of the refrigerant circulating in the refrigeration equipment,
The control unit sets a low pressure set value after the predetermined time at a time before the ice heat accumulator starts to store heat lower than a low pressure set value before the time. The control device described in 1. An acquisition unit for acquiring a low pressure set value set by the control unit;
Further includes a database that stores the low-pressure set value set by the control unit in the past and the temperature transition in the cabinet of the showcase included in the cooling device at that time in association with each other;
The control unit refers to the database based on the low pressure set value acquired by the acquisition unit, acquires a past temperature transition in the low pressure set value, and the temperature indicated by the temperature transition exceeds a predetermined temperature The control device according to claim 5, wherein a low pressure set value lower than the low pressure set value acquired by the acquisition unit is set. An acquisition unit for acquiring a low pressure set value set by the control unit;
Further includes a database that stores the low-pressure set value set by the control unit in the past and the temperature transition in the cabinet of the showcase included in the cooling device at that time in association with each other;
The control unit acquires a past temperature transition at the set temperature with reference to the database based on the low pressure set value acquired by the acquisition unit, and when the temperature indicated by the temperature transition is equal to or lower than a predetermined temperature, The control device according to claim 5, wherein a low pressure set value higher than the low pressure set value acquired by the acquisition unit is set.

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